yasirjanjua

drill 1
href="https://jsbin.com/jehiyes/embed?js,console"
drill 2
https://jsbin.com/rawebir/edit?js,console
drill 3
https://jsbin.com/sifawow/edit?js,console
drill 4
https://jsbin.com/dudinex/edit?js,console
drill 5
https://jsbin.com/jegixi/edit?js,console

yasirjanjua

drill 1
https://jsbin.com/fenonuq/edit?js,console
drill 2
https://jsbin.com/yejarip/edit?js,console
drill 3
https://jsbin.com/sunuboz/edit?js,console
drill 4
https://jsbin.com/jijarix/edit?js,console

yasirjanjua

What is scope? Your explanation should include the idea of global vs. local scope.
JavaScript has two scopes: global and local. A variable that is declared outside a function definition is a global variable, and its value is accessible and modifiable throughout your program. A variable that is declared inside a function definition is local
Why are global variables avoided?
Global variables are accessible through out the program and their value can be manipulated unwantedly which causes error. That is why global variables are avoided.
Explain JavaScript's strict mode
JavaScript strict mode changes silent mistakes to throw erroes.It doesn't allow any variable to get initialize without proper delaration.
What are side effects, and what is a pure function?
A pure function doesn't depend on and doesn't modify the states of variables out of its scope. Concretely, that means a pure function always returns the same result given same parameters. 
Explain variable hoisting in JavaScript.
The behaviour of js interpreter

yasirjanjua

<h1>Drill 1<h1/>
  <a class="jsbin-embed" href="https://jsbin.com/woyefo/embed?js,console">JS Bin on jsbin.com</a><script src="https://static.jsbin.com/js/embed.min.js?4.0.2"></script>
<h1>Drill 2<h1/>
  <a class="jsbin-embed" href="https://jsbin.com/lobolob/embed?js,console">JS Bin on jsbin.com</a><script src="https://static.jsbin.com/js/embed.min.js?4.0.2"></script>
<h1>Drill 3<h1/>
  <a class="jsbin-embed" href="https://jsbin.com/nigeke/1/embed?js,console">JS Bin on jsbin.com</a><script src="https://static.jsbin.com/js/embed.min.js?4.0.2"></script>
<h1>Drill 4<h1/>
  <a class="jsbin-embed" href="https://jsbin.com/qelazu/5/embed?js,console">JS Bin on jsbin.com</a><script src="https://static.jsbin.com/js/embed.min.js?4.0.2"></script>
<h1>Find<h1/>
  <a class="jsbin-embed" href="https://jsbin.com/wiwijac/1/embed?js,output">JS Bin on jsbin.com</a><script src="https://static.jsbin.com/js/embed.min.js?4.0.2"></script>

yasirjanjua

Traffic Lights
https://jsbin.com/getecu/edit?js,console,output

Errors
https://jsbin.com/saqeca/edit?js,console,output

yasirjanjua

AreaOfRectangle
function computeArea(width, height) {
  // your code here
  return width*height
}


/* From here down, you are not expected to 
   understand.... for now :)  
   

yasirjanjua

WisePersonGenerator
function wisePerson(wiseType, whatToSay) {
  // your code here
  var str = 'A wise ' + wiseType + ' once said: "' +
      whatToSay + '".';
  return str;
}


/* From here down, you are not expected to